diff --git a/paddle/fluid/recordio/chunk_test.cc b/paddle/fluid/recordio/chunk_test.cc
index 98ca99b9a018db2da9aa563741ff3cf30461c4ce..5177475c016097d9a118aa79f855672354b3ef53 100644
--- a/paddle/fluid/recordio/chunk_test.cc
+++ b/paddle/fluid/recordio/chunk_test.cc
@@ -43,5 +43,5 @@ TEST(Chunk, Compressor) {
 
   ch.Clear();
   ch.Parse(ss);
-  ASSERT_EQ(ch.NumBytes(), 18);
+  ASSERT_EQ(ch.NumBytes(), 18ul);
 }